268 da alarm sounding while underway

Jabfd32

New Member
Jun 10, 2018
12
Boat Info
1987 sea ray 268 da 2003 Suburban 2500
Engines
2007 5.7L mercruiser 250 hp alpha 1 gen 1
Hello all

So I got the boat in the water and I get an alarm while trying to cruise if I keep it under 1500 rps no alarm if I run it up to 3500 rpm the sound is intermittent. The temp gage stays under 180 but fluctuates between 165-180 and the alarm goes off even when the gage reads 165 so I don’t think it’s a temp thing. Some one said it could be something the halon system but not sure but not sure thanks so n advances
 
So I took the boat out today and when the alarm sounded i was only around 170 gage and when I use an ir gun it read 158 to 160 on the thermostat housing not sure what is making this alarm go off
 
On my Merc 5.0 the horn sounds for three reasons. Oil pressure, water temp and low level of drive oil in the reserve bottle.
 
Mine was doing the same thing and it was a buzzer activated because if high water in the bilge I didn't realize it when I went into the bilge looking for the cause due to the water having been taken care if by the bilge pump coming on with the float switch . I had a pinhole leak in my lower exhaust tube. I would try running again and recreating the circumstance with the engine cover open. Carefully if course with a friend to run the boat and observe for water coming in . Points of entry could be water pump . Hoses or exhaust tubes. As well as gimbal bearing
bellows shift cable bellows. Cracked exhaust manifold.. best of luck
 
I have a known water leak (schedule to be repaired soon) and coming off plane last week I got the dreaded BEEEEEEP which scared the crap put of me. Water must have sloshed enough to trigger the 2nd high water float.

All other gauges were reading correctly.... water, oil, and drive lube level correct.
 
Beeep sound

I have no water in the bildge yet dropped the boat in on Saturday hasn’t rained and have no leaks bildge is completely dry. Oil pressure was good and I have alpha 1 gen 1 so no oil tank
 

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